n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 18 |
3 | 126 |
4 | 810 |
5 | 5022 |
6 | 30618 |
7 | 185166 |
8 | 1115370 |
9 | 6705342 |
10 | 40271418 |
11 | 241746606 |
12 | 1450833930 |
13 | 8706066462 |
14 | 52239587418 |
15 | 313447090446 |
16 | 1880711240490 |
17 | 11284353536382 |
18 | 67706379498618 |
19 | 406239051832686 |
20 | 2437436635519050 |
21 | 14624626786683102 |
22 | 87747781640805018 |
[0,2,18,126,810,5022,30618,185166,1115370,6705342, 40271418,241746606,1450833930,8706066462, 52239587418,313447090446,1880711240490, 11284353536382,67706379498618,406239051832686, 2437436635519050,14624626786683102, 87747781640805018] |